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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96faa0691c7a0d99d451bd801744aef21e104bee7a203ca889385f322447ebee' 
  AND token = 'iLF0/bY1KmuJElPJHFs3764YuOasZi5hNJ5/DNchKCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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