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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd7275abd1b3a37c1271ede388894e01aa6a7ed4214798255c41f6b0ebf00be3' 
  AND token = 'H9+2jXDnyeUQt760/PWHDqGe+kPakIHQZoj3BhRpBO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}