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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27fbfcbaf04a0f814e0fc59c208ffd645a24cb594f103a0d2381c72dc32bb0d1' 
  AND token = '+v/Ivqdjz0+DckpIObRso9kt2sJAVp7cxJhcIHtrV98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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