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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '961c46250e7a7ea87e272bbdd159c9f1ad3312351cfa3f29419f8784ab7ee7d1' 
  AND token = 'RlLURNhtYXI+I3/v0SrqAY45CXcrgotiui+K9aTp4tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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