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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bff622414f842b19ef86517c1a6f9773e81f87e13ec570019f885e180c0d9d1a' 
  AND token = 'BWjp4+j+5xSHNlTJS9z1eku/rahr9t5cwoai2blWhMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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