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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23da1ecd3eb9105e2443364a102aa2814c334be74737f15656212d185428c25a' 
  AND token = 'i+t8XbeWccCvq1t9773QIudFPBFmQYNSkq+Z25OXbUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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