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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9471fdb8a102886fb2a371b797053f6bb9c8eb481732936379d7d85699ea0fad' 
  AND token = 'tM5OmCodv1rcd+/8ga2yv9j0zZ0BfYUaBffuxyVxaR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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