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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccb49e5d0760eddb58b840435523a5ecccb962c45df73a6e61c2a0df2e072e91' 
  AND token = 'z/qnTo3EdzZtgMBZ2waou59YAMgQqt0S6FiWKreNi5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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