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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28e4403d1a3d36b7e16c0feaba73be49a0fe92b9127333d1f1d96a37be36151c' 
  AND token = 'fiuuHFAwQ1710D6j7n7+FB73znr+CxXmLcUbeOcX1Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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