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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77c060a498b0dd98fa096aec1bffc59a4dc8ebf0cfb5f49ecd493b6751031da0' 
  AND token = '4ufTmHdTWNlMZUyYFoJrjoGPZTB78yzbULNrjUFpGIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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