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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aea4e82e023f13e3e2a7576d53423b5e277f9418281de18ff7620daa3f9d943' 
  AND token = 'ErryyT+jyQz5bUtVwPgMRYI4TUpL2hDwwtwJ2098ESM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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