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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88e20fe63defb6c378af476ad7746628b732aba0b92ce5b08b2420a32782e73c' 
  AND token = 'iw+Q8EGP4HEPruVvZV5yX+trF6ZTm1+U6B2hdsVc3wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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