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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbd6f81d2c55b06551bb9f3d1f47f7f08dd39e2069be1c4899ad87c6751ee506' 
  AND token = 'qF0I7QOaRdTif/ZsCOL/bbvVAZQ6hSO9X2yw8qzNh8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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