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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1919ee526957ff72ffaf7afb109ad709bcae79a0ba9458509de62fef98d09a94' 
  AND token = 'pTjZUG4lpsB4R8bYl5mWF1ytM5JM3uNwRVKYBuQUDrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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