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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77eae1f74c4f30d83cead4c3e65a349f5e2bffbc746e101a0796d4b9879d672c' 
  AND token = 'WTgKgwyUN1W0NCwPEl0ov0eFsSLCXbSBvLInjkr3dYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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