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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44833dc689b45dfbeda0ed1817554151c6b8e41fbcac60b39e7678ad5bc0ea5c' 
  AND token = 'Lc3QLDfEI3+QnGALMh4Rkhj5Jt08WcHxwpW8uZAvszs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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