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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd3d260b8708565bd47c0c86bd550f55337cca532ffe72619b506dca9e93c50e' 
  AND token = 'stZGhlQs5LcNeuhz2xrPflE/tnDrimWgdYcaCsql1DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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