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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6373914ab33960a07364acae48f073bae3ef8acf00085eb187da3678f6426950' 
  AND token = 'ICe1DF1o5uM4jOdUvJn6H3G+pE6D+0DgNWY04bvBG0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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