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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fa7c55387e6a60690970b409d5b7ffa8b1fb2cd89078aa06f4e6519b6380f5e' 
  AND token = 'fDGm9X0Afj8LSTdmOlMUaOwHQpchMS5p7Rm1EdKJPmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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