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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae1014f825667e2c94dab920764fda238d6b965fd7e608843e1ce0d429a1f529' 
  AND token = 'VOEEWyDeAqZ+Fzqua42VrQRhw2kHi/oEHUEVk6oOh+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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