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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcb3c0a91521c986a2489ce77555efd4c4279d73a580ec1b3db6e16ef1b29b7c' 
  AND token = 'Jr/8kMD2k9mHdrQ6OBvi5MEqcisTN/ANk2ASDUBd3W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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