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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a150de38357cb0a0b0bc007ff97b3407583c46a15aaa6dfb55c344f58db08666' 
  AND token = 'X0ugGt9RvZwH7XLI7h+0Us0GEhq+eQso49zd91WdRoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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