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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9af305c4fe0a1e6dc7f33ec92021f5f9843d5404b01719f094d8e77aaed4e27c' 
  AND token = 'Y0fVefq3Wnkryn/2jTBYKBEqnCS8Vn0Js9WgLPI/My4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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