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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e017ca2c5624b3876137db2f07715d963fa1504cfe2908f9e838501110566b49' 
  AND token = 'orVsMBzUV7KLNBiuNl+WS7kQ97l6qkecT87LAaBu9k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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