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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4070de0ac87b9cdc62bdb20d2673b1d20743f7ef80badb9c4bba9e8843ba42c8' 
  AND token = 'zP/CfGXZnKBWus6Ypry+/crybVCGlW1Nt1abrLQxup8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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