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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b45330b72c5dcaa1bc6ad61428030fc4d3ba94fd1e2de5d9a6c7bc30bbea8c6b' 
  AND token = '7KL2VBos/Aqs4qi/1EwKvwsVjx124DpLquPvd2A492c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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