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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58cce6c4ab572d9e7c12d302a74863b99aeda18d619113bdbb630e50c54e2dfe' 
  AND token = 'I+FfNdTTpxJxjiEnwsPz20M0TpJMtBCZHWW6i81/eaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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