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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60c0d4796ff7b6747e5a78abac44ea701ed6b6d00ff9795a4d69370ca614badc' 
  AND token = 'An0B3ESqRgojpEU3Nih4sWFjKAXNSe+mszcTP7ClHF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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