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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a582f20e0425d815838ca3fb1b61c74a6aec38d572be8f17bcf7213bd548c68e' 
  AND token = '2Dl99e+dj2F2EMB0VaTomdmQ3F+XQBL0gtgptOnmEQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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