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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ead965d66c251cec2667dbd591b1093a9cfc0bbd3a6c1d6d87a8865ace4d122b' 
  AND token = 'a0pSfNlLYZvnDwkaF6YiL4BQpMVBQcDZysZ0y/frsrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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