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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34911b3e361b1cf4f6569c6e8021990d1960d9288211659cfb8a5e562da45fbf' 
  AND token = '5kCRh0GOno7dNcNIfLxl6NVUqi1pU8A4nHxo+JJjJBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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