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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0d9ce4d1837e56623dd733738cc9cffe253ecba13f26179eb6f3985251714a0' 
  AND token = 'kf7rHAj9Ue8BjN5TpV+Dehn0FxIaClia1Cj8xS8v4Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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