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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02edcd0766ceb18ae6e7f92e14c1c328f8b7a95e671d32ef5548867b3861819b' 
  AND token = 'C3NyJm5Xn2NlmxBHo72yE3lp93io9bK9yn4YiMKDr0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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