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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8600486106a058eac858dc62886f0f9946efd5c3efa24dc7c07cc4cc7e55cf6d' 
  AND token = '7chYB9vFo/Eqer7yNVzkSjT97Eq/OAIpkdSuInPnC7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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