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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13dec00ac94900ea0d51dddf1d993e78c2540ea0efadd0f0b0187fda0f2d0bc7' 
  AND token = 'cMJIOdeLa2LtkwO1isG1KMsbwMmlmoXljbOlthu7+Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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