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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '616a24d56b8f06f2b86ddcc504b4c543e6ab2d4e8f6bb288a8f80879e98b7cb4' 
  AND token = 'zdLM49s/6Ja2qlPkOTPljaAguM0LjY10O8OuP+F8Qro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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