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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '889a517c617f309d6e2815e9a64a81a71897818a9cd736e0c36072a9ceb1a09f' 
  AND token = 'QN9pG+90iY0x8HrPZ7xnbAiBOiX6rsj613FOLcMGso4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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