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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '789e3d9d3a4b648b5813bc240f7ce32c737c595913bf2421bf563ec677cc4271' 
  AND token = 'M0dwUup/m1mEcAN66J/qgLLjbcSZsEFiyYFYQPc4Mek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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