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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f55fb5474608f3885ac9284c0e06f312c2d5498c117928d9ea59abbcbf0ed336' 
  AND token = 'nfdQ7aCIefN8wyOaRLYqp/MoUtQkctNjtpErCy6ObMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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