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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26d1a7a455b739c70a1682ba1b1818f62014b787907be6cb5db4d7177927fdac' 
  AND token = 'thHyvgz0Yaumsy8hR+xPZS6FUppezztN1GyueNdMm9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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