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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a40ae29104045f3ab8a4b10e541ac4e3afb98ea87d1bc8fdef18c547f7a880e8' 
  AND token = 'k1mwTFXbXK8SGjlURZCR1hBl4qBZcY1G3UwWWSH0EyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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