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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77874b6842538f79d924243780ef930d7359445578cb859c92c9a1207680cdf7' 
  AND token = 'kHbTj6+1gffx6dkq3HOm+l/H9cU+dwzvWIV6Nfkv478=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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