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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2c04a550c55ea25b63ba8743c2a2a7647c2e08cbb54db20b3e712cd7bee276d' 
  AND token = 'g/Xf+PTuE7QN8dlaOHF4DF/HvPTFNpSoI3BQUgr7hCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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