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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09ca2972d9205aebbfb664a6fb3ca1e976ba0973a2039e66d9e53aafe91c1c70' 
  AND token = 'NVAr8H3/hu9LclyNjhXt+Dxu+Sf1JkV375yfl1+z4pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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