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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31bc710380f06f0754c6953128e2ca03d430d789d2469398fd6d3862e701c292' 
  AND token = 'czEdJeZN6PBYLe3bOsCIKJC/kHHS+agZoDCEf069dJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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