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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7aa892fa60c2f3fb9d22e0a4c262e76a9f5f07509ea07035cfeefb2615f6e069' 
  AND token = 'b5Ho2/JpmPz3uasGj+Fki5uBbpImTwxy/P4BrW2W4so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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