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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08fd52a7e284ac85269da4728d93daddb257524172505876ca20907c06d0cd20' 
  AND token = 'm9c3B8+xUVl39L6Za+XhR8ihX/nd3S3g+c44P8RFbFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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