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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f02dcfbc930d001f6e5adccb3e1ca1f7ecb5f2588054a04c4bcb5f7d06c974bb' 
  AND token = 'S0hozogtBR2gTEe3RyRhpmkPNurjlkPgIBQ3HiftGmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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