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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08e37480fd0e0fb5e9665fb70be7dc7a4c09b4354f0ea96848dc0b63c1791b35' 
  AND token = 'sHeP9C+fg+2l6u80fHcaVBNlrCEaZ+pMT7HQheOBnsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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