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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '867ca2babaf76dd4f268d898f79cb4e029af5a259fdd7d63eb1fab6a20931522' 
  AND token = 'MPhSFBlNVwbvXZWpQTo68+nQdL0o1Qq+4cDiR2k5yTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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