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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0b9586332aa6a0b52c1179c05712b4e8eed7ac289735b64e20f44655c1ca721' 
  AND token = 'HLNbtuWDdCo3I69xphLfW41NfPEgWso/8F+waeh4x9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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