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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4baea8f02468e10fe3ba07c0ca1cd30bb1eb8f6a75fa854c18ccaa5fbc91ced' 
  AND token = '5O5X7IvYNsCyjG6COSWrc0zXwacf6M83qwIpik+0Vds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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