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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd514607c77fa78e30f5eaf646c4e5bd0c9e35a0fe80395208f2f90767be83e4d' 
  AND token = 'lxk1LWHU5qItc4TCo8wTKEQSEMeeE8TxtPFbfxssyTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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