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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c1d3f8ec99259dc316e1954ec21135a050b92e85eeb2114a459f84e1bf30a82' 
  AND token = 'eT0/p630fRY6YeL4A9wX8EHaRxtrLgosJdjWGRRbPzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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