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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4eaa47c507557d1243a26d322bb80a22dcf52265fc33f5521a9d16b26da2203' 
  AND token = 'Iv22DEFEbnFnH3Gy+w89b0aa7afDcquxey+nfPxKBrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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