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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bfecf67860356f27702344a05b498207f5693d27ccbc4e6fe29f8e5433e5aec' 
  AND token = '1jRXlCR5I1Q5eddhfIBUpi/Xh1xSSTo0cEU4UBaABLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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