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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7f2d262812a98bc0f5a4e2f98303cca1e327047f665d2392d8abd3438f35208' 
  AND token = '+YuVoanyt4NooaZqkEr75ewYHNScQ3rVJ0L0PMiblis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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