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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed7ffcc8067a26a56c32155051814146fb20e55838f97d4caeb34a7153f10c83' 
  AND token = 'hinOvYyr/BnHvEvspyufLR7m5Fc92vI98Bds3Em2JOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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