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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b2125d87f1041dcbf8567feab23f390a0f9b879c1dac90c7e93481df4ed576c' 
  AND token = 'no1vH7w8KWI50kV0qwya9NNwJ+Pvv5S02S35tlsJpBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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