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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a4755d65b82c931085b495f42e8eb5b9a1fb6c2643263ca9331e3e3bf68be92' 
  AND token = 'UtOjmiBMy+rIDRQd0P59XCwSm4ewBlKqahNKyhiw2eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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