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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5692ae087a7d0f9c15f737cce8ace305d93022c2ad1fc23b6ad0b0b16e09544' 
  AND token = '7XlNjosdNulzTefqZwJ5ZXm7avmm0IyilMqhtyqb040=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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