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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '588bb2c800244d16fccda8118812c4482aa010f250a8154bcabacb2cc26698c6' 
  AND token = '+FVUNNm1dE3kEK8x2GQq9VYPEPbjioTgMdWVqDJSMXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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